If a Rock Started with 1,000 Atoms of a Parent

question 109

Multiple Choice

If a rock started with 1,000 atoms of a parent but now contains 250 atoms, how many half lives have passed?

• A).25 half lives
• B).5 half lives
• C)2 half lives
• D)4 half lives
• E)There is no way to tell.

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Definitions:

Ireland

An island in the North Atlantic, divided into the Republic of Ireland, an independent nation, and Northern Ireland, part of the United Kingdom.

Puritans

A group of English Protestants in the 16th and 17th centuries who sought to purify the Church of England of Roman Catholic practices, maintaining that the Church of England was only partially reformed.

Anglicans

Members of the Church of England or of any churches in communion with it, which combine Catholic and Protestant traditions.

Petition of Right

A constitutional document submitted to Charles I by the English Parliament in 1628 to limit the king's authority and assert the rights of subjects, including freedom from arbitrary arrest and taxation without Parliament's consent.